Your Switch can actually record videos but it requires a MicroSD and a way to put the MicroSD in your PC. Here is how you can get some footage of cheaters.
1. Spectate the rule breaker for 30 seconds and once you've seen enough hold the screenshot button for 3 seconds, this will automatically save the last 30 seconds of your screen as a clip.
2. Go into your Switch gallery and click the video, then click copy and copy the video to your MicroSD.
3. Put the MicroSD in your PC and upload that video file onto YouTube.
4. Finally report it as normal in our Bedrock subforum. (
https://www.cubecraft.net/forums/report-a-bedrock-player-or-bug.88/)
The only alternative way to do this is using a capture card but a lot of the good ones are upwards of 80 euros, but these two methods are the only way to report people on Switch with footage.